Thread: Muffs for a mercury

Originally Posted by Bricks

I believe that is only for flushing not running the engine my Opti has the same thing and flushing only.

Mine says to connect via flush port and either do it with motor off or running. I would personally only do it at idle speeds, but you cant run them over 2k when on muffs anyways.

I use muffs because its just as easy to grab them off the shelf, and i can run without worry until the thermostat opens to flush the whole block.

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Originally Posted by Kevin22

The last two generations of 4 strokes have a hose attachment built in. Not sure about the 2 strokes

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My optimax does 2008

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